tag.c: use 'ref-filter' data structures

diff --git a/git-compat-util.h b/git-compat-util.h
index c6d391f86490b94e4df667d64d54323e1915c477..4515c494ee3873c0668be9d52892b14386390b7e 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -812,6 +812,9 @@ static inline int strtoul_ui(char const *s, int base, unsigned int *result)
        char *p;
 
        errno = 0;
+       /* negative values would be accepted by strtoul */
+       if (strchr(s, '-'))
+               return -1;
        ul = strtoul(s, &p, base);
        if (errno || *p || p == s || (unsigned int) ul != ul)
                return -1;